BRAKES
5-51
DIAGNOSIS—DRUM BRAKES
LOW PEDAL OR PEDAL GOES TO TOE BOARD
Probable Cause
Remedy
1
.
Excessive clearance between l i n i n g s and drum.
1
.
A d ju s t brakes.
2. Automatic a d ju s te rs not working.
2. Make forwa rd and reve rse stop s; i f pedal stays low,
r e p a i r f a u l t y a d ju s t e r s .
3. . Leaking c o n du its.
3. Repair o r rep la c e f a u l t y p a r ts .
4. Leaking wheel c y l i n d e r .
4. Overhaul wheel c y l i n d e r , as o u t lin e d p re v io u s ly in
t h i s s e c t io n .
5. Leaking master c y l i n d e r .
5. Overhaul master c y l i n d e r as o u t lin e d p re v io u s ly in
t h i s s e c t io n .
6. A i r i n system.
6. Bleed system.
7. Plugged master c y li n d e r f i l l e r cap.
7. Clean f i l l e r cap vent ho le s; bleed system.
8.
Improper brake f l u i d .
8. Flush system and r e f i l l w i th GM Hyd rau lic Brake F lu id
Supreme No. 11 ( o r e q u i v a l e n t ) .
9. Low f l u i d l e v e l .
9. F i l l r e s e r v o ir w ith GM Hydraulic Brake F lu id Supreme
No. 11 ( o r e q u i v a l e n t ) ; bleed system.
SPRINGY, SPONGY PEDAL
Probable Cause
Remedy
1
.
A i r trapped in h y d r a u lic system.
1
.
Remove a i r by ble e d in g .
2.
Improper brake f l u i d .
2. Flush and bleed system using GM Hyd ra u lic Brake F lu id
Supreme No. 11 (o r e q u i v a le n t ) .
3.
Improper l i n i n g th ickness o r lo c a t i o n .
3.
I n s t a l l new l i n i n g o r repla ce shoe and l i n i n g .
4. Drums worn too t h i n .
4. Replace drums.
5. Master c y l i n d e r f i l l e r ven t clogged.
5. Clean vent o r rep la c e cap; bleed brakes.
E X C E SSIV E PED A L PRESSU RE REQ U IRED TO STOP V E H IC LE
Probable Cause
Remedy
1
.
Brake adjustment not c o r r e c t .
l
.
A d ju s t the brakes.
2. I n c o r r e c t l i n i n g .
2. I n s t a l l new l i n i n g s .
3. Grease o r f l u i d soaked l i n i n g .
3. Repair grease seal o r wheel c y l i n d e r .
I n s t a l l new
1i n in g s .
4. Improper f l u i d .
4
.
Flush ou t system; f i l l w i th GM Hyd rau lic Brake F lu id
Supreme No. 11 ( o r e q u i v a l e n t ) ; bleed system.
5. Frozen master o r wheel c y l i n d e r p is to n s .
5. Overhaul master or wheel c y li n d e r s as o u t lin e d
p r e v io u s ly in t h i s s e c t io n .
6. Brake pedal bind in g on s h a f t .
6. L u b r ic a te w i t h Delco Brake Lube #5450032 (o r e q u iv a le n t ) .
LIGHT DUTY TRUCK SERVICE MANUAL
Summary of Contents for Light Duty Truck 1973
Page 1: ......
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Page 53: ...HEATER AND AIR CONDITIONING 1A 27 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 115: ...LIGHT DUTY TRUCK SERVICE M A N U A L HEATER AND AIR CONDITIONING 1A 89...
Page 123: ...BODY 1B 3 Fig 6 Typical 06 Van LIGHT DUTY TRUCK SERVICE MANUAL...
Page 149: ...BODY 1B 29 Fig 84 Body Mounting 06 Fig 85 Body Mounting 14 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 171: ...LIGHT DUTY TRUCK SERVICE M A N U A L Fig 2 Frame Horizontal Checking Typical FRAME 2 3...
Page 173: ...LIGHT DUTY TRUCK SERVICE M A N U A L Fig 4 10 30 Series Truck Frame FRAME 2 5...
Page 174: ...2 6 FRAME LIGHT DUTY TRUCK SERVICE MANUAL Fig 5 Underbody Reference Points G Van...
Page 185: ...FRONT SUSPENSION 3 11 Fig 16 Toe out on Turns LIGHT DUTY TRUCK SERVICE MANUAL...
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Page 351: ...ENGINE 6 15 Fig ID Sectional View of Eight Cylinder Engine LIGHT DUTY TRUCK SERVICE MANUAL...
Page 375: ...EN G IN E 6 39 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 376: ...6 4 0 ENGINE LIGHT DUTY TRUCK SERVICE MANUAL...
Page 377: ...ENG IN E 6 41 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 378: ...LIGHT DUTY TRUCK SERVICE MANUAL Fig 37L K Series Engine Front Mount 6 42 ENG INE...
Page 400: ...6 6 4 ENG INE LIGHT DUTY TRUCK SERVICE MANUAL...
Page 401: ...ENG IN E 6 65 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 402: ...6 6 6 ENGINE LIGHT DUTY TRUCK SERVICE MANUAL...
Page 403: ...E NG IN E 6 67 Fig 36V C Series Engine Mounts LIGHT DUTY TRUCK SERVICE MANUAL...
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Page 423: ...EN G IN E C OOLING 6K 13 Fig 16 Overheating Chart LIGHT DUTY TRUCK SERVICE MANUAL...
Page 424: ...6 K 1 4 ENG INE COOLING Fig 17 Coolant Loss Chart LIGHT DUTY TRUCK SERVICE MANUAL...
Page 456: ...6M 32 ENGINE FUEL Fig K15 Accelerator Controls G Van L 6 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 492: ......
Page 512: ...Fig 18e Vacuum Advance Diagram V8 Engine...
Page 516: ...6 T 2 4 E M IS S IO N CONTROL SYSTEMS LIGHT DUTY TRUCK SERVICE MANUAL...
Page 528: ......
Page 590: ......
Page 593: ...CLUTCHES MANUAL TRANSMISSIONS 7M 3 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 598: ...7M 8 CLUTCHES MANUAL TRANSMISSIONS LIGHT DUTY TRUCK SERVICE MANUAL...
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Page 743: ...FUEL TANKS AND EXHAUST 8 13 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 744: ...8 14 FUEL TANKS AND EXHAUST LIGHT DUTY TRUCK SERVICE MANUAL...
Page 760: ...8 30 FUEL TANKS AND EXHAUST Fig 40 Exhaust Pipe P Models LIGHT DUTY TRUCK SERVICE MANUAL...
Page 761: ...FUEL TANKS AND EXHAUST 8 31 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 763: ...FUEL TANKS AND EXHAUST 8 33 LIGHT DUTY TRUCK SERVICE MANUAL...
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Page 832: ...LIGHT DUTY TRUCK SERVICE MANUAL Fig 106 Power Steering Pump Mounting Typical 9 66 STEERING...
Page 833: ...PUMP ASSEMBLY STEERING GEAR TYPICAL SMALL V8 TYPICAL LARGE V8 STEERING 9 67...
Page 861: ...STEERING 9 95 Fig 134 Power Steering Pump Leakage LIGHT DUTY TRUCK SERVICE MANUAL...
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Page 886: ...11 10 CHASSIS SHEET METAL LIGHT DUTY TRUCK SERVICE MANUAL...
Page 891: ...ELECTRICAL BODY AND CHASSIS 12 5 LIGHT DUTY TRUCK SERVICE MANUAL...
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